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SNC 1D Atomic Structure Basic Particles of Matter: Atoms Proton Electron Neutron Nucleus Orbit/Shell Empty space Subatomic Particles: Particles Charge Mass Location Protons positive 1 Nucleus Electrons negative 1 Orbits/shells Neutrons neutral 1/1000 nucleus SNC 1D Electrons are arranged in _orbits_____ or __shells______ around the nucleus of an atom. Energy Levels Maximum Amount of Electrons it Can Hold 1st At least 2 2nd At least 8 3rd At least 8 4th At least 8 Bohr Rutherford Diagram: Oxygen 8 O 8P Oxygen 8N 16 Number of Prontons____8______ Number of Electrons___8_____ SNC 1D Number of Neutrons_____8____ Element Information: Atomic Number Chemical Symbol Chemical Name Atomic Mass 3 Li Lithium 7 1. The ____Atomic Number_____________ of an atom = number of Protons in the nucleus. 2. The __Atomic Mass_______ of an atom = number of Protons + Neutrons in the nucleus. 3. The number of Protons = Number of Electrons. 4. Electrons orbit the nucleus in ___shells__________. 5. Each shell can only carry a ____set___ number of electrons.